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If your antenna is well balanced I would recommend the following. - Disable tracking- Manually peak az/el and call operator to commission.

I have seen at times with tracking on the carrier fluctuate 1-3db and just enough where the operator will not pass because of this fluctuation. Never hurts to call back and ask for another operator as well.

When you call up the satellite provider for a croos-pol check on a stablised antenna you must tell them it is a stablised terminal. Because stablised antennas have different tolerances with their cross-pol than fixed dishes.

If you are transmitting approx equal levels into both circular polarisations at the satellite it is likely that you are transmitting linear polarisation. This may happen if you have linear feed system (just OMT to the horn) without a polariser or have a polariser but have installed the polariser incorrectly.

If you have a polariser (long tube, square or circular with two rows of pins or slots inside) you have it with the pins/slots lined up the same as the linear polarisations of the OMT. That is wrong.

The lines of pins/slots must be at 45 deg relative to the OMT TX/RX waveguides. Do that.

Now you will transmit all power on one circular polarisation. If you are now correct your receive performance will improve by at least 3 dB. If you are wrong you won't get any of your wanted receive signal at all. If you are on wrong polarisation undo the big circular flange and turn the OMT 90 deg, so it is 45 deg the other way. Check with the hub when you are ready to transmit.